First Characterization of Ostreopsis cf. ovata (Dinophyceae) and Detection of Ovatoxins during a Multispecific and Toxic Ostreopsis Bloom on French Atlantic Coast

Type Article
Date 2022-07
Language English
Author(s) Chomérat NicolasORCID1, Antajan ElvireORCID2, Auby IsabelleORCID2, Bilien GwenaelORCID1, Carpentier Liliane3, de Casamajor Marie-NoelleORCID4, Ganthy FlorianORCID2, Hervé FabienneORCID3, Labadie Magali5, Méteigner ClaireORCID2, Paradis CamilleORCID5, Perrière-Rumèbe Myriam2, Sanchez FlorenceORCID4, Séchet VeroniqueORCID3, Amzil ZouherORCID3
Affiliation(s) 1 : Ifremer, LITTORAL, 29900 Concarneau, France
2 : Ifremer, LITTORAL, 33120 Arcachon, France
3 : Ifremer, PHYTOX, 44000 Nantes, France
4 : Ifremer, LITTORAL, 64600 Anglet, France
5 : Centre Anti-Poison et Toxicovigilance, CHU de Bordeaux, 33076 Bordeaux, France
Source Marine Drugs (1660-3397) (MDPI AG), 2022-07 , Vol. 20 , N. 7 , P. 461 (23p.)
DOI 10.3390/md20070461
WOS© Times Cited 13
Note This article belongs to the Special Issue Marine Biotoxins 2.0
Keyword(s) Ostreopsis cf, ovata, ovatoxins, intoxication, microscopy, phylogeny, LC-MS, MS, human respiratory symptoms

Blooms of the benthic toxic dinoflagellate genus Ostreopsis have been recorded more frequently during the last two decades, particularly in warm temperate areas such as the Mediterranean Sea. The proliferation of Ostreopsis species may cause deleterious effects on ecosystems and can impact human health through skin contact or aerosol inhalation. In the eastern Atlantic Ocean, the toxic O. cf. ovata has not yet been reported to the north of Portugal, and the only species present further north was O. cf. siamensis, for which the toxic risk is considered low. During summer blooms of unidentified Ostreopsis species on the French Basque coast (Atlantic) in 2020 and 2021, people suffered from irritations and respiratory disorders, and the number of analyzed cases reached 674 in 2021. In order to investigate the causes, sampling was carried out during summer 2021 to (i) taxonomically identify Ostreopsis species present using a molecular approach, (ii) isolate strains from the bloom and culture them, and (iii) characterize the presence of known toxins which may be involved. For the first time, this study reports the presence of both O. cf. siamensis and O. cf. ovata, for which the French Basque coast is a new upper distribution limit. Furthermore, the presence of ovatoxins a, b, c, and d in the environmental sample and in a cultivated strain in culture confirmed the toxic nature of the bloom and allowed identifying O. cf. ovata as the producer. The present data identify a new health risk in the area and highlight the extended distribution of some harmful dinoflagellates, presumably in relation to climate change.

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Chomérat Nicolas, Antajan Elvire, Auby Isabelle, Bilien Gwenael, Carpentier Liliane, de Casamajor Marie-Noelle, Ganthy Florian, Hervé Fabienne, Labadie Magali, Méteigner Claire, Paradis Camille, Perrière-Rumèbe Myriam, Sanchez Florence, Séchet Veronique, Amzil Zouher (2022). First Characterization of Ostreopsis cf. ovata (Dinophyceae) and Detection of Ovatoxins during a Multispecific and Toxic Ostreopsis Bloom on French Atlantic Coast. Marine Drugs, 20(7), 461 (23p.). Publisher's official version : , Open Access version :